Expansion panel memory leak

[anthonn]

Bug, feature request, or proposal:

I have an SPA that uses angular material2. When using mat-expansion-panel I get rising number Detatched DOM trees if removing/adding the expansion panel.

What are the steps to reproduce?

If browsing to https://material.angular.io/components/expansion/examples and clicking on API -> Examples -> API and so on this behaviour could be reproduced. First after entering the page chrome heap snapshot shows:

After clicking the tabs API, and Examples 10 times it shows:

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

In my SPA I use:

• Angular 5.0.1
• Angular Material: 5.0.0-rc0
• Angular CLI 1.5.0

[josephperrott]

Closed via #8410

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